any Baader mpcc III users?

[alacant]

Hi everyone. I was thinking of getting one until I saw this comparison where it comes out worst of the bunch. Especially damning was the observation that it makes stars in the centre of the frame fatter/fuzzier. If not Baader and bearing in mind the ts-quattro/GSO/Altair is also a non starter for me, what else could I consider? TIA.

[Thalestris24]

Hi

It might be a good idea to re-post this in the imaging section

Louise 

[Adam J]

On 09/12/2016 at 22:26, alacant said:

Hi everyone. I was thinking of getting one until I saw this comparison where it comes out worst of the bunch. Especially damning was the observation that it makes stars in the centre of the frame fatter/fuzzier. If not Baader and bearing in mind the ts-quattro/GSO/Altair is also a non starter for me, what else could I consider? TIA.

looks like a load of rubbish to me that image with the MPCCMKIII is not focused as shown by the doubling of the diffraction spike. So any comparison with the Sky-watcher image (which is focused) is meaningless. Dont believe everything you read on the internet.

[jetstream]

I've heard the MPC MKIII add spherical abberation- do any imagers have evidence of this? I'm looking to use one visually but don't want to degrade the contrast. I've also heard this CC does NOT add SA...

Any advice is appreciated.

[jetstream]

I've heard the MPC MKIII add spherical abberation- do any imagers have evidence of this? I'm looking to use one visually but don't want to degrade the contrast. I've also heard this CC does NOT add SA...

Any advice is appreciated.

[Adam J]

here is my last image with the MPCC MKIII let me know if you see any spherical aberration. (Its a processing error with the stars on the right hand side, I stretched without removing a mask first and did not notice).

[wimvb]

From what I've read about the Baader, it seems that the performance depends on f-ratio. They seem ok down to f/5. Another issue may be that the working distance of cc's is possibly f-ratio or focal length dependent. Have a look here a few posts down, the best distance of the skywatcher cc depends on focal length.

http://www.cloudynights.com/topic/521493-which-coma-corrector/

This makes it non-trivial to compare.